In case anyone else encountered this problem. You have to edit your function and check the "has return value" box. Then your return will work. After this you have to use "Call Function" again and now you have a new field for saving results.
Add list item to variable
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How can you loop items from a list list to a variable ?
Edit :
I think i've solved it .
For people who will find the answer to this in the future
set a new variable to "0" or the starting point of the list --->"Get Element" in list menu and at the "index" put your variable ----> to get the next list item do an increment to the variable set to "0"
